I noticed some failures in Boost.Locale using std backend and narrowed it down to broken Japanese_Japan.932 support of codecvt facet. I tried to report it on https://connect.microsoft.com/VisualStudio but it shown me " You are not authorized to submit the feedback for this connection. " How can I report the bug to Mircrosoft? Thank You, Artyom Below is the sample to reporoduce the issue: Works ok on MSVC 10 and below Fails on MSVC2017 - and it should work ---------------------- #include <iostream> #include <locale> #include <fstream> int main() { { // Japan in Shift JIS/cp932 char const *japan_932 = "\x93\xfa\x96\x7b"; std::ofstream f("testi.txt"); f<> ref; if(ref != cmp) { std::cout << "FAIL" << std::endl; std::cout << "REF" << std::endl; for(size_t i=0;i